Differences

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--- u-boot_boot_sequence [2019/12/27 17:48] – [7.] rpjday
+++ u-boot_boot_sequence [2019/12/28 08:33] (current) – [1.] rpjday
@@ Line 19: / Line 19: @@
 ===== arch/arm/lib/crt0_64.S [ENTRY(_main)] =====
-==== 1. ====
+==== Prologue ====
 <code>
@@ Line 25: / Line 25: @@
  * start-up where a C runtime environment is needed. Its entry point
  * is _main and is branched into from the target's start.S file.
- *
+</code>
- * _main execution sequence is:
- *
+==== 1. ====
+<code>
  * 1. Set up initial environment for calling board_init_f().
  *    This environment only provides a stack and a place to store
@@ Line 200: / Line 202: @@
 ===== common/board_f.c =====
-===== common/board_r.c (only most common) =====
-==== initr_dm() [C] ====
-==== board_init() [A,B] ====
-==== board_early_init_r() (not for Zynq) ====
-==== arch_early_init_r() [A] ====
-  * arch/arm/mach-zynq/cpu.c
-  * arch/arm/mach-zynq/spl.c
 <code>
-#if defined(CONFIG_ARCH_EARLY_INIT_R)
+void board_init_f(ulong boot_flags)
-int arch_early_init_r(void)
 {
-#if (defined(CONFIG_FPGA) && !defined(CONFIG_SPL_BUILD)) || \
+        gd->flags = boot_flags;
-    (defined(CONFIG_SPL_FPGA_SUPPORT) && defined(CONFIG_SPL_BUILD))
+        gd->have_console = 0;
-        int cpu_id = cpu_desc_id();
-        if (cpu_id < 0)
+        if (initcall_run_list(init_sequence_f))
-                return 0;
+                hang();
+                ...
-        fpga.size = zynq_fpga_descs[cpu_id].fpga_size;
-        fpga.name = zynq_fpga_descs[cpu_id].devicename;
-        fpga_init();
-        fpga_add(fpga_xilinx, &fpga);
-#endif
-        return 0;
-}
-#endif
 </code>
-==== initr_mmc() [C] ====
+===== common/board_r.c =====
 <code>
-#ifdef CONFIG_MMC
+void board_init_r(gd_t *new_gd, ulong dest_addr)
-static int initr_mmc(void)
-{
-        puts("MMC:   ");
-        mmc_initialize(gd->bd);
-        return 0;
-}
-#endif
-</code>
-==== initr_env() [C] ====
-<code>
-static int initr_env(void)
-{
-        /* initialize environment */
-        if (should_load_env())
-                env_relocate();
-        else
-                set_default_env(NULL, 0);
-#ifdef CONFIG_OF_CONTROL
-        env_set_hex("fdtcontroladdr",
-                    (unsigned long)map_to_sysmem(gd->fdt_blob));
-#endif
-        /* Initialize from environment */
-        load_addr = env_get_ulong("loadaddr", 16, load_addr);
-        return 0;
-}
-</code>
-==== show_board_info() [C] ====
-From ''common/board_info.c'':
-<code>
-int __weak checkboard(void)
-{
-        return 0;
-}
-/*
- * If the root node of the DTB has a "model" property, show it.
- * Then call checkboard().
- */
-int __weak show_board_info(void)
-{
-#ifdef CONFIG_OF_CONTROL
-        DECLARE_GLOBAL_DATA_PTR;
-        const char *model;
-        model = fdt_getprop(gd->fdt_blob, 0, "model", NULL);
-        if (model)
-                printf("Model: %s\n", model);
-#endif
-        return checkboard();
-}
-</code>
-For ''zynqmp.c'':
-<code>
-int checkboard(void)
-{
-        puts("Board: Xilinx ZynqMP\n");
-        return 0;
-}
-</code>
-==== arch_misc_init() ====
-Some arches and boards, not Zynq.
-<code>
-#ifdef CONFIG_ARCH_MISC_INIT
-        arch_misc_init,
-#endif
-</code>
-==== misc_init_r() ====
-<code>
-#ifdef CONFIG_MISC_INIT_R
-        misc_init_r,
-#endif
-</code>
-==== initr_enable_interrupts() ====
-<code>
-#ifdef CONFIG_ARM
-static int initr_enable_interrupts(void)
-{
-        enable_interrupts();
-        return 0;
-}
-#endif
-</code>
-From ''arch/arm/lib/interrupts.c'':
-<code>
-int interrupt_init (void)
 {
         /*
-         * setup up stacks if necessary
+         * Set up the new global data pointer. So far only x86 does this
+         * here.
+         * TODO(sjg@chromium.org): Consider doing this for all archs, or
+         * dropping the new_gd parameter.
          */
-        IRQ_STACK_START_IN = gd->irq_sp + 8;
+#if CONFIG_IS_ENABLED(X86_64)
+        arch_setup_gd(new_gd);
+#endif
-        return 0;
+#ifdef CONFIG_NEEDS_MANUAL_RELOC
-}
+        int i;
-void enable_interrupts (void)
-{
-        return;
-}
-int disable_interrupts (void)
-{
-        return 0;
-}
-</code>
-==== initr_ethaddr() [C] ====
-<code>
-#ifdef CONFIG_CMD_NET
-        initr_ethaddr,
 #endif
-</code>
-<code>
-#ifdef CONFIG_CMD_NET
-static int initr_ethaddr(void)
-{
-        bd_t *bd = gd->bd;
-        /* kept around for legacy kernels only ... ignore the next section */
+#if !defined(CONFIG_X86) && !defined(CONFIG_ARM) && !defined(CONFIG_ARM64)
-        eth_env_get_enetaddr("ethaddr", bd->bi_enetaddr);
+        gd = new_gd;
-#ifdef CONFIG_HAS_ETH1
-        eth_env_get_enetaddr("eth1addr", bd->bi_enet1addr);
 #endif
-#ifdef CONFIG_HAS_ETH2
+        gd->flags &= ~GD_FLG_LOG_READY;
-        eth_env_get_enetaddr("eth2addr", bd->bi_enet2addr);
-#endif
-#ifdef CONFIG_HAS_ETH3
-        eth_env_get_enetaddr("eth3addr", bd->bi_enet3addr);
-#endif
-#ifdef CONFIG_HAS_ETH4
-        eth_env_get_enetaddr("eth4addr", bd->bi_enet4addr);
-#endif
-#ifdef CONFIG_HAS_ETH5
-        eth_env_get_enetaddr("eth5addr", bd->bi_enet5addr);
-#endif
-        return 0;
-}
-#endif /* CONFIG_CMD_NET */
-</code>
-==== board_late_init() [B] ====
+#ifdef CONFIG_NEEDS_MANUAL_RELOC
+        for (i = 0; i < ARRAY_SIZE(init_sequence_r); i++)
-(Defined in board/xilinx/zynq/board.c.)
+                init_sequence_r[i] += gd->reloc_off;
-<code>
-#ifdef CONFIG_BOARD_LATE_INIT
-        board_late_init,
 #endif
-</code>
-==== initr_net() ====
+        if (initcall_run_list(init_sequence_r))
+                hang();
-<code>
+        /* NOTREACHED - run_main_loop() does not return */
-#ifdef CONFIG_CMD_NET
+        hang();
-static int initr_net(void)
-{
-        puts("Net:   ");
-        eth_initialize();
-#if defined(CONFIG_RESET_PHY_R)
-        debug("Reset Ethernet PHY\n");
-        reset_phy();
-#endif
-        return 0;
-}
-#endif
 </code>